#include<cstdio>//BAONI
#include<algorithm>

template<class T>void read(T &x)
{
	x=0;int f=0;char ch=getchar();
	while(ch<'0'||ch>'9') { f|=(ch=='-'); ch=getchar(); }
	while(ch<='9'&&ch>='0') { x=(x<<1)+(x<<3)+(ch^48); ch=getchar(); }
	x = f ? -x : x;
	return ;
}

int n;
int l[1010];

int main()
{
	read(n);
	for(int i=1;i<=n;++i)
		read(l[i]);
	if(l[1]%2&&l[n]%2&&n%2==1)
	{
		printf("Yes");
	}
	else
	{
		printf("No");
	}
	return 0;
}
